221121222211 has 4 divisors (see below), whose sum is σ = 221129296024. Its totient is φ = 221113148400.

The previous prime is 221121222173. The next prime is 221121222221. The reversal of 221121222211 is 112222121122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221121222211 - 2¹¹ = 221121220163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221121222221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3995685 + ... + 4050646.

It is an arithmetic number, because the mean of its divisors is an integer number (55282324006).

Almost surely, 2^221121222211 is an apocalyptic number.

221121222211 is a deficient number, since it is larger than the sum of its proper divisors (8073813).

221121222211 is an equidigital number, since it uses as much as digits as its factorization.

221121222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8073812.

The product of its digits is 128, while the sum is 19.

Adding to 221121222211 its reverse (112222121122), we get a palindrome (333343343333).

The spelling of 221121222211 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".